<!doctype html>
<html>

<head>
    <meta charset="UTF-8">
</head>

<body>
    <script>
        var apk_name = "abc-20210806.apk";
        window.onload = function () {
            var url = location.href;
            url = url.replace("download.html", apk_name);
            window.location.href = url;
        }
    </script>
</body>